<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>javascript</title>
</head>
<body>    
</body>
<script type="text/javascript">
    document.write("使用Javascript脚本语言循环输出hello world！")
    for(var i=0;i<3;i++){
        document.write('<h1>hello world!</h1>');
    }
</script>
</html>
